Now running on one ram and savemode went away

Hello,I have a dell 3100 deskstop I was on line but then the screen went blue, and went in to save mode, so I did everything like clean the rams check the battery, the computer had 6 beeps, so what I did is that I took one the rams out and now the computers works on 256K but slow now so do you think If I up graded to 2 gb
that this will work properly and the savemode will be okay, I did switch the good ram to the other slot but it started beeping again so I put back and now it works but at 256k slow so what do you think about this problem Iam haveing or just get another computer but not dell that's for sure. Thanks , K.H.